Product name:Direct Red 75 tetrasodium salt
CAS:2829-43-8
Molecular Formula:C33H22N8Na4O15S4
Formula Weight:990.79
Specification:5g
Chemical property:brown powder.Easily souble in water.
Use:Used mainly for textile printing and dyeing.
Description:Direct Red 75 tetrasodium salt is a brown powder. Good water solubility, slightly soluble in ethylene glycol ethyl ether, ethanol, insoluble in other organic solvents. Its aqueous solution is magenta, add concentrated hydrochloric acid to produce purple precipitation, add caustic soda to produce red precipitation. In concentrated sulfuric acid in the grayish blue, diluted purple; Partially dissolves in concentrated nitric acid and becomes black. When dyeing copper, iron ion color light slightly changed.
Direct Red 75 tetrasodium salt is based on p-nitroaniline o-sulfonic acid and amino acid as the main raw materials. First, the p-nitroaniline o-sulfonic acid is diazotized and coupled with the amino acid. After reduction, the product is obtained by condensation with phosgene or dichloromethyl carbonate.